对于两个数组

arr1=[1,3,4,5,8,9]

arr2=[2,3,7,8,9]

求出交集与并集

test.java

1 import java.util.ArrayList; 2 import java.util.Collections; 3  4  5 public class test1 { 6     public static void main(String[] args) { 7     ArrayList
     
       tmplist=new ArrayList
      
       (); 8     int[] arr1={1,3,4,5,8,9}; 9     int[] arr2={2,3,7,8,9};10     tmplist=Intersection(arr1,arr2);11     OutPut(tmplist);12     tmplist.clear();13     tmplist=Union(arr1,arr2);14     OutPut(tmplist);15     }16     private static ArrayList
       
         Intersection(int[] a1,int[] a2){17         ArrayList
        
          list=new ArrayList
         
          ();18         for(int i=0;i
          
            Union(int[] a1,int[] a2){26 ArrayList
           
             list1=new ArrayList
            
             ();27 ArrayList
             
               list2=new ArrayList
              
               ();28 for(int i:a1)29 list1.add(i);30 for(int i:a2)31 list2.add(i);32 list1.removeAll(list2);33 list2.addAll(list1);34 return list2;35 }36 37 private static void OutPut(ArrayList
               
                 list){38 Collections.sort(list);39 if(list.size()==0)40 System.out.println("null");41 else42 for(int i:list)43 System.out.print(i);44 System.out.println("\n");45 }46 }